Schengen Visa rejected twice (Portugal) even after holding Valid US & UK Visa, Past Greece and Germany Type C Schengen Visa ( expired )

I applied for a tourist visa ( solo travel) to Portugal for 3 weeks. I hold Indian passport with active US Visa until 2031, UK Visa valid until 30th April, 2026 and multiple expired schengen visa including Germany and Greece. I applied at VFS Bangalore, India, about 2 months before my travel date, got a rejection within a weeks time. Reapplied with more strong documents including financial documents, property papers, etc etc ( all that is required ), but again for a rejection letter ( after 3 weeks ). Extremely surprised and shocked with such extensive travel in past. I have travelled to multiple countries in past including Turkey, Singapore, Hong Kong, South Africa, Sri Lanka etc etc. What do you think the reason of thought that my Visa got rejected?